There are over 500 species of sharks on earth, from the giant 40 foot whale shark to the tiny six inch dwarf lantern shark. Sharks are found in all five of the earth's oceans and many freshwater lakes and rivers across the world.
How are shark teeth unique?
Unlike humans, who are born with all of the teeth we'll use in our lifetimes embedded into our jaws, sharks grow more teeth in their gums to replace the ones they lose. Sharks can lose up to 30,000 teeth in their lifetimes.
Are sharks dangerous to humans?
Sharks are rarely dangerous to people. Of the 500 species of sharks, only four have attacked humans unprovoked, and less than five humans every year are killed by sharks across the world. Humans are far larger threats to sharks than sharks are to humans.